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|~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|MOTOROLA MICROPROCESSOR & MEMORY TECHNOLOGY GROUP
|M68000 Hi-Performance Microprocessor Division
|M68060 Software Package
|Production Release P1.00 -- October 10, 1994
|
| 
|THE SOFTWARE is provided on an "AS IS" basis and without warranty.
|To the maximum extent permitted by applicable law,
|MOTOROLA DISCLAIMS ALL WARRANTIES WHETHER EXPRESS OR IMPLIED, 
|INCLUDING IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
|and any warranty against infringement with regard to the SOFTWARE
|(INCLUDING ANY MODIFIED VERSIONS THEREOF) and any accompanying written materials.
|
|To the maximum extent permitted by applicable law,
|IN NO EVENT SHALL MOTOROLA BE LIABLE FOR ANY DAMAGES WHATSOEVER
|(INCLUDING WITHOUT LIMITATION, DAMAGES FOR LOSS OF BUSINESS PROFITS,
|BUSINESS INTERRUPTION, LOSS OF BUSINESS INFORMATION, OR OTHER PECUNIARY LOSS)
|ARISING OF THE USE OR INABILITY TO USE THE SOFTWARE.
|Motorola assumes no responsibility for the maintenance and support of the SOFTWARE.
|
|You are hereby granted a copyright license to use, modify, and distribute the SOFTWARE
|so long as this entire notice is retained without alteration in any modified and/or
|redistributed versions, and that such modified versions are clearly identified as such.
|No licenses are granted by implication, estoppel or otherwise under any patents
|or trademarks of Motorola, Inc.
|~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
| os.s
|
| This file contains:
|       - example "Call-Out"s required by both the ISP and FPSP.
|

#include <linux/linkage.h>

|################################
| EXAMPLE CALL-OUTS             #
|                               #
| _060_dmem_write()             #
| _060_dmem_read()              #
| _060_imem_read()              #
| _060_dmem_read_byte()         #
| _060_dmem_read_word()         #
| _060_dmem_read_long()         #
| _060_imem_read_word()         #
| _060_imem_read_long()         #
| _060_dmem_write_byte()        #
| _060_dmem_write_word()        #
| _060_dmem_write_long()        #
|                               #
| _060_real_trace()             #
| _060_real_access()            #
|################################

| 
| Each IO routine checks to see if the memory write/read is to/from user
| or supervisor application space. The examples below use simple "move"
| instructions for supervisor mode applications and call _copyin()/_copyout()
| for user mode applications.
| When installing the 060SP, the _copyin()/_copyout() equivalents for a 
| given operating system should be substituted.
|
| The addresses within the 060SP are guaranteed to be on the stack.
| The result is that Unix processes are allowed to sleep as a consequence
| of a page fault during a _copyout.
|
| Linux/68k: The _060_[id]mem_{read,write}_{byte,word,long} functions
| (i.e. all the known length <= 4) are implemented by single moves
| statements instead of (more expensive) copy{in,out} calls, if
| working in user space

|
| _060_dmem_write():
|
| Writes to data memory while in supervisor mode.
|
| INPUTS:
|       a0 - supervisor source address  
|       a1 - user destination address
|       d0 - number of bytes to write   
|       0x4(%a6),bit5 - 1 = supervisor mode, 0 = user mode
| OUTPUTS:
|       d1 - 0 = success, !0 = failure
|
        .global         _060_dmem_write
_060_dmem_write:
        subq.l          #1,%d0
        btst            #0x5,0x4(%a6)           | check for supervisor state
        beqs            user_write
super_write:
        move.b          (%a0)+,(%a1)+           | copy 1 byte
        dbra            %d0,super_write         | quit if --ctr < 0
        clr.l           %d1                     | return success
        rts
user_write:
        move.b          (%a0)+,%d1              | copy 1 byte
copyoutae:
        movs.b          %d1,(%a1)+
        dbra            %d0,user_write          | quit if --ctr < 0
        clr.l           %d1                     | return success
        rts

|
| _060_imem_read(), _060_dmem_read():
|
| Reads from data/instruction memory while in supervisor mode.
|
| INPUTS:
|       a0 - user source address
|       a1 - supervisor destination address
|       d0 - number of bytes to read
|       0x4(%a6),bit5 - 1 = supervisor mode, 0 = user mode
| OUTPUTS:
|       d1 - 0 = success, !0 = failure
|
        .global                 _060_imem_read
        .global         _060_dmem_read
_060_imem_read:
_060_dmem_read:
        subq.l          #1,%d0
        btst            #0x5,0x4(%a6)           | check for supervisor state
        beqs            user_read
super_read:
        move.b          (%a0)+,(%a1)+           | copy 1 byte
        dbra            %d0,super_read          | quit if --ctr < 0
        clr.l           %d1                     | return success
        rts
user_read:
copyinae:
        movs.b          (%a0)+,%d1
        move.b          %d1,(%a1)+              | copy 1 byte
        dbra            %d0,user_read           | quit if --ctr < 0
        clr.l           %d1                     | return success
        rts

|
| _060_dmem_read_byte():
| 
| Read a data byte from user memory.
|
| INPUTS:
|       a0 - user source address
|       0x4(%a6),bit5 - 1 = supervisor mode, 0 = user mode
| OUTPUTS:
|       d0 - data byte in d0
|       d1 - 0 = success, !0 = failure
|
        .global                 _060_dmem_read_byte
_060_dmem_read_byte:
        clr.l           %d0                     | clear whole longword
        clr.l           %d1                     | assume success
        btst            #0x5,0x4(%a6)           | check for supervisor state
        bnes            dmrbs                   | supervisor
dmrbuae:movs.b          (%a0),%d0               | fetch user byte
        rts
dmrbs:  move.b          (%a0),%d0               | fetch super byte
        rts

|
| _060_dmem_read_word():
| 
| Read a data word from user memory.
|
| INPUTS:
|       a0 - user source address
|       0x4(%a6),bit5 - 1 = supervisor mode, 0 = user mode
| OUTPUTS:
|       d0 - data word in d0
|       d1 - 0 = success, !0 = failure
|
| _060_imem_read_word():
| 
| Read an instruction word from user memory.
|
| INPUTS:
|       a0 - user source address
|       0x4(%a6),bit5 - 1 = supervisor mode, 0 = user mode
| OUTPUTS:
|       d0 - instruction word in d0
|       d1 - 0 = success, !0 = failure
|
        .global                 _060_dmem_read_word
        .global                 _060_imem_read_word
_060_dmem_read_word:
_060_imem_read_word:
        clr.l           %d1                     | assume success
        clr.l           %d0                     | clear whole longword
        btst            #0x5,0x4(%a6)           | check for supervisor state
        bnes            dmrws                   | supervisor
dmrwuae:movs.w          (%a0), %d0              | fetch user word
        rts
dmrws:  move.w          (%a0), %d0              | fetch super word
        rts

|
| _060_dmem_read_long():
| 

|
| INPUTS:
|       a0 - user source address
|       0x4(%a6),bit5 - 1 = supervisor mode, 0 = user mode
| OUTPUTS:
|       d0 - data longword in d0
|       d1 - 0 = success, !0 = failure
|
| _060_imem_read_long():
| 
| Read an instruction longword from user memory.
|
| INPUTS:
|       a0 - user source address
|       0x4(%a6),bit5 - 1 = supervisor mode, 0 = user mode
| OUTPUTS:
|       d0 - instruction longword in d0
|       d1 - 0 = success, !0 = failure
|
        .global                 _060_dmem_read_long
        .global                 _060_imem_read_long
_060_dmem_read_long:
_060_imem_read_long:
        clr.l           %d1                     | assume success
        btst            #0x5,0x4(%a6)           | check for supervisor state
        bnes            dmrls                   | supervisor
dmrluae:movs.l          (%a0),%d0               | fetch user longword
        rts
dmrls:  move.l          (%a0),%d0               | fetch super longword
        rts

|
| _060_dmem_write_byte():
|
| Write a data byte to user memory.
|
| INPUTS:
|       a0 - user destination address
|       d0 - data byte in d0
|       0x4(%a6),bit5 - 1 = supervisor mode, 0 = user mode
| OUTPUTS:
|       d1 - 0 = success, !0 = failure
|
        .global                 _060_dmem_write_byte
_060_dmem_write_byte:
        clr.l           %d1                     | assume success
        btst            #0x5,0x4(%a6)           | check for supervisor state
        bnes            dmwbs                   | supervisor
dmwbuae:movs.b          %d0,(%a0)               | store user byte
        rts
dmwbs:  move.b          %d0,(%a0)               | store super byte
        rts

|
| _060_dmem_write_word():
|
| Write a data word to user memory.
|
| INPUTS:
|       a0 - user destination address
|       d0 - data word in d0
|       0x4(%a6),bit5 - 1 = supervisor mode, 0 = user mode
| OUTPUTS:
|       d1 - 0 = success, !0 = failure
|
        .global                 _060_dmem_write_word
_060_dmem_write_word:
        clr.l           %d1                     | assume success
        btst            #0x5,0x4(%a6)           | check for supervisor state
        bnes            dmwws                   | supervisor
dmwwu:
dmwwuae:movs.w          %d0,(%a0)               | store user word
        bras            dmwwr
dmwws:  move.w          %d0,(%a0)               | store super word
dmwwr:  clr.l           %d1                     | return success
        rts

|
| _060_dmem_write_long():
|
| Write a data longword to user memory.
|
| INPUTS:
|       a0 - user destination address
|       d0 - data longword in d0
|       0x4(%a6),bit5 - 1 = supervisor mode, 0 = user mode
| OUTPUTS:
|       d1 - 0 = success, !0 = failure
|
        .global                 _060_dmem_write_long
_060_dmem_write_long:
        clr.l           %d1                     | assume success
        btst            #0x5,0x4(%a6)           | check for supervisor state
        bnes            dmwls                   | supervisor
dmwluae:movs.l          %d0,(%a0)               | store user longword
        rts
dmwls:  move.l          %d0,(%a0)               | store super longword
        rts


#if 0
|###############################################

|
| Use these routines if your kernel doesn't have _copyout/_copyin equivalents.
| Assumes that D0/D1/A0/A1 are scratch registers. The _copyin/_copyout
| below assume that the SFC/DFC have been set previously.
|
| Linux/68k: These are basically non-inlined versions of
| memcpy_{to,from}fs, but without long-transfer optimization
| Note: Assumed that SFC/DFC are pointing correctly to user data
| space... Should be right, or are there any exceptions?

|
| int _copyout(supervisor_addr, user_addr, nbytes)
|
        .global                 _copyout
_copyout:
        move.l          4(%sp),%a0              | source
        move.l          8(%sp),%a1              | destination
        move.l          12(%sp),%d0             | count
        subq.l          #1,%d0
moreout:
        move.b          (%a0)+,%d1              | fetch supervisor byte
copyoutae:
        movs.b          %d1,(%a1)+              | store user byte
        dbra            %d0,moreout             | are we through yet?
        moveq           #0,%d0                  | return success
        rts

|
| int _copyin(user_addr, supervisor_addr, nbytes)
|
        .global                 _copyin
_copyin:
        move.l          4(%sp),%a0              | source
        move.l          8(%sp),%a1              | destination
        move.l          12(%sp),%d0             | count
    subq.l      #1,%d0
morein:
copyinae:       
        movs.b          (%a0)+,%d1              | fetch user byte
        move.b          %d1,(%a1)+              | write supervisor byte
        dbra            %d0,morein              | are we through yet?
        moveq           #0,%d0                  | return success
        rts
#endif

|###########################################################################

|
| _060_real_trace():
|
| This is the exit point for the 060FPSP when an instruction is being traced
| and there are no other higher priority exceptions pending for this instruction
| or they have already been processed.
|
| The sample code below simply executes an "rte".
|
        .global         _060_real_trace
_060_real_trace:
        bral    SYMBOL_NAME(trap)

|
| _060_real_access():
|
| This is the exit point for the 060FPSP when an access error exception
| is encountered. The routine below should point to the operating system
| handler for access error exceptions. The exception stack frame is an
| 8-word access error frame.
|
| The sample routine below simply executes an "rte" instruction which
| is most likely the incorrect thing to do and could put the system
| into an infinite loop.
|
        .global         _060_real_access
_060_real_access:
        bral    SYMBOL_NAME(buserr)



| Execption handling for movs access to illegal memory  
        .section .fixup,#alloc,#execinstr
        .even
1:      moveq           #-1,%d1
        rts
.section __ex_table,#alloc
        .align 4
        .long   dmrbuae,1b
        .long   dmrwuae,1b
        .long   dmrluae,1b
        .long   dmwbuae,1b
        .long   dmwwuae,1b
        .long   dmwluae,1b
        .long   copyoutae,1b
        .long   copyinae,1b
        .text